A　novel　Z-scheme　Ag2CO3-NG　heterojunction　photocatalyst　by　employing　N-doped　graphene　(NG)　was　successfully　synthesized　with　enhanced　photocatalytic　activity　for　micmcystin-LR　(MC-LR)　degradation.　Characterization　results　suggested　that　doping　of　N　can　promote　the　nucleation　and　crystallization　of　Ag2CO3.　Photocatalytic　tests　showed　that　Ag2CO3-NG　with　30　wt.%　N-participation　(AGON/1-30)　showed　the　best　photocatalytic　performance　under　visible-light　irradiation,　which　could　remove　MC-LR　in　7.5　min,　superior　to　Ag2CO3-GO　composite.　Multiple　factors　including　dosage,　pH　value,　MC-LR　concentration,　H2O2,　and　the　coexistence　of　Microcystis　aeruginosa　were　studied　to　reveal　the　environmental　impact　on　MC-LR　degradation.　Results　showed　that　center　dot　OH,　center　dot　O-2(-),　as　well　as　center　dot　CO3-　were　the　main　ROSs　in　MC-LR　degradation.　The　excellent　reusability　and　stability　of　AGON/1-30　were　proved　through　five　consecutive　cycles　of　degradation.　Therefore,　the　Z-scheme　Ag2CO3-NG　heterojunction　photocatalyst　is　a　promising　technique　for　MC-LR　remediation.